Gen3: Power reading
Last updated: October 28, 2026
Gen3 measures the voltage and the current. Then Gen3 calculates the power in watts (W). The Mysa app shows this power, multiplied by the percentage of time that the heater is on. Thus the power reading can be between 0 W and the full load of your heater. A reading between these values is correct. It is not a problem.
V2 is different. V2 uses a relay, and the app gets only the relay state (on or off). Thus the V2 power reading is 0 W or the full load of your heater.
What you see on Gen3
A power reading between 0 W and the full load, when Gen3 keeps the room at the setpoint.
A power reading that changes when Gen3 increases or decreases the heat.
0 W, when Gen3 does not heat.
Where to find the power reading
Open the Mysa app.
Select your Gen3.
Find the power reading in watts on the control screen.
How Gen3 and V2 are different
Gen3 | V2 | |
|---|---|---|
Heat switching | Silent triac switching | Relay (on or off) |
Power reading | Measured voltage and current, multiplied by the percentage of time that the heater is on | 0 W or the full load |
Readings between 0 W and the full load | Usual | Not usual |
If the power reading looks incorrect
Feel the heater. A warm heater with a power reading between 0 W and the full load can be usual on Gen3.
Make sure that the heater type is correct. On the home screen of the Mysa app, tap your thermostat. Tap the Settings tab. Tap Thermostat Preferences. In Heater Type, select Baseboard, Fan Forced or Radiant.
If the power reading is 0 W in Heat mode, and the room is much colder than the setpoint, contact support.
If the power reading stays at the full load, and the room is warmer than the setpoint, turn off the circuit breaker. Then contact support. Do not touch the wires when the power is on. Also refer to Installation & Wiring Troubleshooting.
To see the energy over days or months, tap the Usage tab in the Mysa app. One power reading does not show the energy over a long time.
Get support
Email: support@getmysa.com. Tell us your model (Gen3). Send a screenshot of the control screen. Tell us if an error code shows on Gen3.